服务端模拟HTTP请求
通过JAVA代码进行HTTP请求的发送
1.准备依赖
<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>
2.创建post和get方式请求的方法
package com.ty.http;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class MyHttpClient {
private static void myPost() throws IOException {
//建立连接请求
CloseableHttpClient httpClient = HttpClients.createDefault();
//创建post请求
HttpPost httpPost = new HttpPost("http://eureka7002.com:6061/myServlet");
//创建参数队列
List<NameValuePair> nameValuePairList=new ArrayList<>();
//准备请求参数队列
nameValuePairList.add(new BasicNameValuePair("userName","你好骚呀"));
//
UrlEncodedFormEntity urlEncodedFormEntity=new UrlEncodedFormEntity(nameValuePairList,"UTF-8");
//讲实体封装到请求当中
httpPost.setEntity(urlEncodedFormEntity);
//发送请求
CloseableHttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
if (entity!=null){
System.out.println("接收到的响应信息:--------"+EntityUtils.toString(entity,"UTF-8"));
}
//资源释放
response.close();
httpClient.close();
}
private static void myGet() throws IOException {
//建立连接请求
CloseableHttpClient httpClient = HttpClients.createDefault();
//创建get请求
HttpGet get=new HttpGet("https://www.baidu.com/");
CloseableHttpResponse response = httpClient.execute(get);
int statusCode = response.getStatusLine().getStatusCode();
//响应成功在操作
if (statusCode==200) {
//获取响应实体
HttpEntity entity = response.getEntity();
//打印响应内容长度
System.out.println("响应文本长度:"+entity.getContentLength());
//打印响应内容
System.out.println("响应内容如下:\n"+EntityUtils.toString(entity,"UTF-8"));
}
System.out.println("--------------------------响应内容打印完毕");
//释放资源
response.close();
httpClient.close();
}
public static void main(String[] args) {
try {
// myGet();
myPost();
} catch (IOException e) {
e.printStackTrace();
}
}
}
4.get测试百度返回结果
5.post测试本机的另一个服务
5.1给项目准备依赖
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.58</version>
</dependency>
5.2创建一个Servlet,接收一个参数,返回json串
package com.ty.servlet;
import com.alibaba.fastjson.JSON;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/myServlet")
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doPost(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
String userName = req.getParameter("userName");
resp.setHeader("Content-type", "text/html;charset=UTF-8");
System.out.println("接受到的数据:"+userName);
String json="成功响应";
resp.getWriter().write(JSON.toJSONString(json));
}
}
